Bit



Feb. 18, 1930. I REED I 1,747,907

E aria H5612.

Patented Feb. 18, 1930 EARL A. REED, OF WItIHITA, KANSAS Applicationfiled March 22, 1927. Serial No. 177,861.

The invention relates to improvements in earth boring drills and moreparticularlyto that type of drill having a revolving or rotary cutter.

It is an object of the invention to provide an improved form of drillfor use in the boring of oil wells and the like. In the useof boringtools of this character the cutters, af-' sarytofrequently renew thesecutters. This,

of course, is true when a rock structure is being operated on. Thereplacement of these cutters in the past hasrequired considerable timeand it is an object of this invention to provide a construction in whichthe cutters can be replaced with little effort and in a very shortperiod of time.

More specifically, the invention comprises a drill in which the head; isformed of sections,

each section being provided with a portion of a pocket which is adaptedto detachably receive and retain a cutter preferably, of-thefrusto-conical type. In accordance with this invention the cutter issupported in the pocket I by a sectional bearing fitting within thesocket formed by the sections of the head. It is a further object of theinvention to provide anv improved means for lubricating the rotarycutter carried by the bit head.

In the drawings, Fig. 1 is a View parts in section,

Fig. 2 is a sectional view on line 2-2 of Fig. 1, an

Fig. 3 is a sectional view through the cutter.

Referring now more particularly to the drawings wherein like referencecharacters in- .dicate corresponding parts, the numerals 1- and 2designate the sections of a bit head. The upper part of each section isthreaded as indicated by the reference character 3 by means of which thehead may be connected to an operlooking at one side with 4 ofieachsection are-provided with semi-circourse, 5 formed in the bit head. v

The lower end of each section of the bit head is provided with \asemi-circular openating stem or the like. I The threaded-portions;

ended pocket 6, which when the bit head is assembled formingtheannulaepocket Tin the lower part of the bit head which is adapted toreceive the cutter.

The cutter is represented by the reference character 8- and may be ofany wellknown conical type. 'The cutter is, of course, held injthebitheadin such a way that it is per- I ter short usuage, become dull andit is necese mitted to rotate or oscillate.

It is an object of the invention to provide an improved means forsupporting the cutter and for permitting this cutter to be re placed byaminimum effort. It will be observed that the semi-cireular pocketsformed 1 in the bit head are provided with annular o5 grooves 9,thefunction of which is to receive and retain sectional bearing devices.The bearing for the cutter 8 is formed from the bearing sections 10 and11, each section having a flange 12 which fits within the complementalgrooves 9 in the sections of the bit head. Each bearing is also formedwith lugs '13 adapted to fit over and engage a shoulder 14 formed at thehead of the cutter 18. The bearing sections'may be secured together byacircular screw cap 15. It will also be observed that the bearingsections have passing therethrough a water passageway 16 through whichwater is introduced through the line 17 passing to one side of the bithead.

From the foregoing description it is apparent that if it is desired toplace a cutter in the bit head the sections 1 and 2 are s bparated'bythe removal of the fastening bolts 19.- The bearing sections 10 and 11are then placed around the forward end of the cutter and this assemblyinserted between the semi-circular pockets 7 in the sections 1 and 2 ofthe bit head. The sections are then 0 drawn together by the tighteningof the nut 9 20 onthe fastening bolt 19 so that the bearing sectionsare' clamped therebetween. When in this position the cutter is free to vrotate and when it is to be removed for replacement it is only necessaryto again loosen the nut-'20, separate the sectionsl and 2, remove the'cutter 8 with its sectional bearings 10 and 11, insert between thesebearingsthe head of a new cutter, and then insert this assembly in thebit head as described.

* recelved within said bear-mg, the contour of "coaction with saidgroove, and-arotary cutter' having a bearing spindle adapted to be thebearing surfaces of said spindle and sectional bearing being such as toprevent. separation thereof in an axial direction when the said partsare in assembled relatiorh 2. In a device of the character described. adrill head comprising separable sections, the

respective sections having complemental bearing receiving pockets formedtherein, said complemental pockets forming an annular recess when thesections-of said head are secured together, the inner peripheral wall ofsaid recess being formed with an annular groove, an annular sectionalbearingmcmber adapted to be positioned with in the said recess andhaving an annular rib for coaction with said groove whereby to preventaxial separation of said bearing and drill head. and a rotary'cutterhaving a bearing spindle adapted. to bc received within said-bearing,the bearing surfaces of said spindle and bearing being of irregular con-.tour in an axial direction whereby to prevent' axial separationthereof.

"f 3. In a device of the character described,

a drill head comprising separable sections, the respective sectionshaving complemental bearing receiving pockets formed therein, saidcomplemental pockets forming an annularrecess when the sections of saidhead are secured together, the inner peripheral wall of said" recessbeing formed with an annular groove, an annular sectional bearingmemberadapted to be positioned within the said recess and having an annularrib for coaction with said groove whereby to prevent axial separationofsaid bearing and drill head, and -'a rotarycutter having a bearingspindle adapted to be received within said bearing, said cutter spindlehaving a substantially frusto conical bearing surface with a reducedportion adjacent the base and said, I sectional bearing having aninternal bearing surface of correspondin contour, whereby to preventaxial separatlon of said spindle and bearing.

4. In a'device ofthe class described, a drill head comprising separablesections, the respective sections having com lemental bearing receivingpockets forme therein,

having complemental.

said complemental pockets forming an annular recess when the sections ofsaid head are secured together, the inner peripheral wall of said recessbeing formed with an annular groove, an annular sectional bearing memberadapted to be positioned within the said recess and having an'annularrib for.

coaction with said groove. and a rotary cutter having a bearing spindleadapted to be received within said bearing, the contour of the bearingsurfaces of said spindle and sectional bearing being such as to preventseparation thereofin an axial direction when the said parts are inassembled relation and a ring surrounding said sectionalbearing memberand having threaded engagement therewith.

5., In a device of the character described, a drill head-comprisingseparable sections, the respective sections having substantiallysemi-cylindricalpockets formed therein, said pockets terminating at oneend in a lower surface of the respective drill head sections and beingsubstantially closed at their opposite ends, whereby to form asubstantially cylindricalpocket having a bottom wallwhen the drillheadsections are assembled, a'sect'ional bearing member adapted to bereceived within said pocket, cooperatlng means on the periphery of saidbearing and the'cylindrical wall of said pocket serving to prevent axialseparation of said bearing member and drill head, and a roller cutterhaving a bearing "spindle adapted to be received within said bearingmember, the bearing surfaces of said spindle and bearing member beingsuch as to prevent separation thereof in an axial direction when thesaid parts are in assembled relation.

6. In adevice of the character described, a drill head comprisingseparable sections, the respective I sections having complementalbearing receiving pockets formed therein, said complemental pocketsforming an annular recess when the sections of said head are securedtogether, the inner peripheral wall of said recess being for-med with anannular groove, an annular sectional bearing member adapted to bepositioned within the said recess and having an annular rib for coactionwith said groove whereby to prevent axial separation of said bearing anddrill head, and a rotary cutter having a bearing spindle adapted to bereceived within said bearing, said cutter spindle terminating in asubstantially frusto conical e'ndportion and having a portion of reduceddiameter adjacent the base of said frusto-conical end and said sectionalbearing member having bearing surfaces matching and engaging both theend and peripheral surfaces of said spindle.

In testimony whereof I afiix my signature.

' I EARL A. REED.

